ω-Assisted α nucleation in a metastable β titanium alloy

SCRIPTA MATERIALIA

卷:171

Article

Shi, Rongpei^1,2,5  Zheng, Yufeng^1,2  Banerjee, Rajarshi^3,4  Fraser, Hamish L.^1,2  Wang, Yunzhi^1,2 

[1] Ohio State Univ, Ctr Accelerated Maturat Mat, 1305 Kinnear Rd, Columbus, OH 43212 USA

[2] Ohio State Univ, Dept Mat Sci & Engn, 1305 Kinnear Rd, Columbus, OH 43212 USA

[3] Univ North Texas, Mat Res Facil, Discovery Pk, Denton, TX 76203 USA

[4] Univ North Texas, Dept Mat Sci & Engn, Discovery Pk, Denton, TX 76203 USA

[5] Lawrence Livermore Natl Lab, Mat Sci Div, Phys & Life Sci Directorate, 7000 East Ave,L-367, Livermore, CA 94550 USA

关键词: Heterogeneous nucleation;    Interphase interface;    Precipitation;    Phase-field simulation;    High resolution scanning transmission electron microscopy;   

DOI  :  10.1016/j.scriptamat.2019.06.020

来源: Elsevier

【 摘 要 】

We investigate mechanisms of omega-assisted alpha nucleation for microstructure refinement in a metastable beta titanium alloy, Ti-20V (wt%). In particular, we analyze quantitatively the individual and combined effects of concentration and stress fields associated with a growing isothermal omega precipitate and the potency of the omega/beta interface on the activation energy barrier for alpha nucleation as a function of the omega precipitate size and coherency state. We find that the complex interplay among these three factors determines the most potent omega particle size for inducing alpha nucleation and the most favorable nucleation site. (C) 2019 Acta Materialia Inc Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free